1978 Ski-Doo Shop Manual, Page 46Get this manual
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SECTION 02 SUB-SECTION 03 (DRIVE PULLEY)
74$piing seat Bolt Guard (rollers) Sliding half Fixed half Nut 20 Counterweight 27 Nylon washer 5.7 mm (.200") 22 Shouldered pin 23 Roller 24 Nylo